The Cape Horn copper showings are located in a logging cut adjacent to the Dunn Creek access road. The showings are 600 metres east of the highway, 11 kilometres north of Nakusp (Assessment Report 21289).
"Strong copper mineralization", presumably chalcopyrite, with "skarn-like" alteration is reported in the metavolcanic sequence (Assessment Report 21289). Assays as high as 3.14 per cent copper were obtained from the showings (Assessment Report 21289). Earlier reports (Minister of Mines Annual Report 1961, page 79) mention copper mineralization in three "shear zones" in diorite, the widest being 1.2 metres wide. The property is located along the western margin of the Jurassic Kuskanax batholith which is composed mainly of aegirine-augite quartz monzonite (GSC Open File 432). Felsic porphyry dikes, possibly related to the batholith, crosscut the layered rocks in the area of the showing. The metavolcanic rocks, mainly amphibolite and gabbroic rocks, belong to the Paleozoic to Triassic Kaslo Group. The metavolcanic rocks are overlain to the southwest by metasedimentary strata of the Triassic Slocan Group which include phyllite, siltstone and limestone (Assessment Report
Mineralization at the Dunn Creek occurrence is observed in a sub outcrop and float material exhibiting disseminated and blebular chalcopyrite and pyrite within rusty altered schist. The mineralization is also described as a steeply eastward dipping quartz-rich amphibolite horizon containing chalcopyrite and pyrite. Bravura Ventures Corp. referenced a grab sample at the occurrence grading 0.43 percent copper (Kerr, J. (2011-02-10): Technical Report on the Greenhorn Property).
The earliest record of work was prospecting in 1903, when "a large showing of low grade copper ore assaying 8 per cent copper and $2.00 gold per ton" was reported (Minister of Mines Annual Report 1903). Three diamond-drill holes "totalling 144 feet" (47 metres) were reported in 1960 (Minister of Mines Annual Report 1961). Geological mapping and a geochemical survey were reported in 1967 (Minister of Mines Annual Report 1967). In 1978, the area was staked for uranium and three stream sediment samples were taken as well as several scintillometer readings (Property File - Report by Donald W. Tully). In 1979, the property was geologically mapped, 35 kilometres of line prepared and surveyed by scintillometer and magnetometer (Assessment Report 7789). A total of 330 soil samples were collected and analysed for copper and lead.
During 1979 and 1982, Cold Lake Resources (1979) were exploring for uranium in the area and located the RB 1 claim, which overlapped the eastern portion of the current Greenhorn property. Exploration consisted of geological mapping, prospecting, soil geochemistry, magnetometer and radiometric surveys. Their work outlined anomalous concentrations of copper in soil (up to 0.0405 per cent) in the western portion of their grid with the most intense anomalies open to the west.
From 1982 to 1989, no work was recorded on the property.
From 1990 to 1996, Brenda Mines located the copper claims and followed up the discovery of a high-grade copper occurrence along the Dunn Creek access road with prospecting, rock and soil sampling over a small grid. Rock samples collected during the 1990 program returned up to 3.14 per cent copper with weakly elevated gold and silver tenors from calc-silicate rocks and mineralized amphibolite. Further work was recommended but not completed.
In 1997, the property was staked by Bruce Doyle. Phelps Dodge optioned the property and completed geological mapping, geochemical, ground geophysical, and diamond drilling surveys. The work was completed by SJ Geophysics of Vancouver, B.C. At the Dunn Creek occurrence, a highlighted sample graded 5.7 percent copper, and 48.4 grams per tonne silver (Allen, G. (2011-11-12): Technical Assessment Report on the Geochemical and Geophysical Surveys on the Greenhorn Property).
In 1999, Crest Geological Consultants Ltd. optioned the property and completed a limited exploration program. The program consisted of geological mapping and prospecting the central part of the grid area, concentrating on the copper soil anomaly and the collection of 26 rock samples. At the Dunn Creek occurrence, the highest grade was 2.3 percent copper in sample 10590 (Allen, G. (2011-11-12): Technical Assessment Report on the Geochemical and Geophysical Surveys on the Greenhorn Property).
During 2005 and 2006, Zappa Resources Inc. completed some limited soil and rock geochemistry on the property. As a result, a second phase of trenching was completed in October, 2005.
In 2010, an airborne geophysical survey by Bravura Ventures Corp. found multiple new areas of possible skarn mineralization, and copper and magnetic horizons in the volcanic sequences. Significant anomalies correlate with the areas of the North Showing, South Showing, and Dunn Creek occurrences.
During the period from July 7 to October 26, 2011, a program of geochemical sampling and geophysical surveying was conducted intermittently on the subject property, at the request of Mr. Chris Dyakowski of Bravura Ventures Corp. A total of 64.7 kilometres of grid were established to cover the known copper showings. The 2011 exploration program showed a 2.4-kilometre-long north-northwest–trending linear in-soil copper anomaly coincident with the known limits of the Dunn Creek copper horizon (V STOCKWATCH, April 26, 2012).
